Car-brake



l Patented Feb. I4, |899. W. W. GEORGE.

C A R B R A K E (Application filed Jan. 81, 1898.)

(No Model.)

V ...Wd/7 1 mvEN-ron 7 WITN ESSES Tus Nonnls Pneus co. Puovouwc,wAsnmsYo UNITED STATES PATENT OFFICE.

vIVILLIAM WV. GEORGE, OF IRWIN, PENSYLVANIA.

CAR-BRAKE.

SPECIFICATION forming part of Letters Patent No. 619,562, dated February14, 1899.

Application filed January 31,'1898. Serial No. 668,533. (No model.)

To all whom t may concern.-

Be it known that I, WILLIAM W. GEORGE, of Irwin, in the county ofWestmoreland and State of Pennsylvania, have invented a new and usefulImprovement in Oar-Brakes, of which the following is a full, clear, andexact description, reference bein g had to the accompanying drawings,forming part of lthis speciication, in which- Figure 1 is an inner sideelevation, partly broken away, of my improved brake in position upon theside frame of a car-truck. Fig. 2 is a similar view of the brake indepressed position. Fig. 3 is an outer side elevation of the brake. Fig.4 is a top plan view. Fig. 5 is a vertical longitudinal section; andFigs. 6 and 7 are cross-sections on the lines VI VI and-VII VII,respectively, of Fig. 2.

My inventionA relates to that type of carbrakes wherein the brake -shoeis pressed against the rail; and it consists in a new and improvedconstruction of brake-operating mechanism therefor whereby theeectiveness of the braking action is increased, the liability to jammingor binding of the brake is avoided, and a simple compact and strongstructure afforded.

In the drawings, 2 represents the side frame of a car-truck, and 2 oneof its wheels. This side frame is of T shape and to it is secured acasting 3, which is provided with a slot entered by the web of the T.Over the top of the side frame extend the straps 4 4, which at theirouter end are provided with bolts passing through flanges cast on thepart 3 and at their inner ends with screw-bolts extending into thecasting, as shown in Fig. 5. The general shape of this casting is shownin Fig. 3, and to its inner face is secured a hollow case 5, containingthe vertically movable brake-block 6. The case is provided with aremovable inner cover-plate 7 and is secured to the casting 3 byscrew-bolts 3, which pass through slotted lips upon the case and enterthe casting, and by a screw bolt 9, which extends through a slot in thecasting and engages the case. The case may thus be vertically adjustedto compensate for the wearing away-of the brake-shoe. The upper portionof the case and its cover-plate is provided with bearings for arock-shaft 10, to which is secured a segmental slotted cam 11.

This cam is adapted to oscillate within the case, and the inner edge ofthe slot is provided with teeth, which engage a toothed wheel 12,carried in a yoke at the upper end of a swinging link 13. The link 13terminates at its lower end in a circular lug, which is carried in asimilarly-shaped recess in the brake-block, it thus forming ahinge-jointbetween the link and the block. The brakeblock is provided on each sidewith pivoted rollers 14, engaging the case, and the lower part of thecase is provided with rollers 15, which engage the sides of the block inits movements. These rollers take up the lateral or side strain upon theAblock and prevent binding of the block in the case, and I preferablyprovide the case with a vertical rib 16, as shown in Figs. 6 and 7,which ts ina corresponding recess in the casting 3 and thus transmitsthe side strain to the casting. The brake-shoe 17 is pivotally connectedto the lower'end of the brake-block. The shaft 10 is provided at itsinner end with a grooved pulley 18, by means of which the brake may beactuated.

The operation is as follows: The parts being normally in the positionshown in Fig. 1, when the shaft 10 is rotated the cam-plate will swingdownwardly, the brake block and shoe moving down by their own gravity,assisted, if necessary, by a spring 19, which engages the link 13 andtends to swing it into a vertical position. The cam-plate is preferablyso arranged that the brake-shoe rests upon the rail when the upper endof the link 13 is beneath the shaft 10, no power having` thus far beenapplied to the brake. When the parts have reached this position, as theshaft is oscillated still further the wheel 12 will ride along theinclined inner cam-face of the slot, thus positively forcing the shoeagainst the rail. The movement of the link 13 in the one direction ispreferably limited by a stop 20, which prevents its being carried beyonda vertical position. Upon the shaft being rocked in the oppositedirection the toothed wheel will ride down the outer surface of the slotin the cam-plate until it reaches the end of the slot, and the furtherswinging of the plate will then swing the link 13 and lift thebrake-block, the parts again resuming their normal positions.

IOO

The advantages of my invention result from the fact that the brake-shoeis lowered substantially into contact with the rail before power isapplied thereto. The power is therefore entirely utilized in pressingthe shoe against the rail. The cam acts to both force the shoe down andlift it up, while the teeth of the cani prevent slipping of the rolleralong its face. These teeth may or may not be used, as desired. A strongand simple construction is aiorded, which may be easily and cheaply madeand is not liable to injury or accidental breakage, while the wearing ofthe shoe may be taken up by adjusting the case vertically.

Many changes may be made in the form and arrangement of the partswithout departing from my invention, since What I claim is- 1. In arail-brake, a verticallymovable brake-block, a rock-shaft carrying adouble cam, and a swinging link connected to the brake-block and havinga roller acted upon by the cam, substantially as described.

2. In a rail-brake, a verticallymovable brak e-block,a rock=shaft,connections between the shaft and the block, said connections bein garranged to allow the block to drop downwardly by gravity before poweris applied, and then positively force the block against the rail, and aspring arranged to aid in the action of gravity and force the blockdownwardly.

3. In a car-brake, a rock-shaft carrying a slotted cam-plate, and aswinging link having a roller movable within the slot, said link beingconnected to the brake-block, the camplate being arranged to swing andlift the link after its roller reaches the end of the slot,substantially as described.

4. In abrake, a rock-shaft carrying a plate provided with an inclinedcurved slot, a depending link having a roller movable in said slot, abrake-block pivotally connected with the link, and a case inclosing thebrake-block, and having guides therefor, substantially as described.

5. In a brake, a rock-shaft carrying a slotted cam-plate, the slothaving teeth engaging a toothed roller carried at the end of a swing inglink, and a brake-block pivoted to the lower end of the link,substantially as described.

6. The combination with a casting arranged to be bolted to atruck-frame, of a brake-case adjustably connected thereto, and abrakeblock vertically movable in the case, substantially as described.

'7. In a rail-brake, a block arranged to bc secured to the truck-frame,and a brake-case secured thereto and having a rib entering the block,substantially as described.

In testimony whereof I have hereunto set my hand.

WILLIAM W. GEORGE. Witnesses:

C. E. MACKOWN, G. I. HoLDsHIP.

